feat: Complete plugin lifecycle management with lazy loading and runtime reload

Major changes:
- Add unload() method to all plugins for proper cleanup (unregister commands/providers/LSP clients, destroy widgets, clear state)
- Implement lazy widget loading via "show" signal across all containers
- Add autoload: false manifest option for manual/conditional plugin loading
- Add Plugins UI with runtime load/unload toggle via Ctrl+Shift+p
- Implement controller unregistration system with proper signal disconnection
- Add new events: UnregisterCommandEvent, GetFilesEvent, GetSourceViewsEvent, TogglePluginsUiEvent
- Fix signal leaks by tracking and disconnecting handlers in widgets (search/replace, LSP manager, tabs, telescope, markdown preview)
- Add Save/Save As to tabs context menu
- Improve search/replace behavior (selection handling, focus management)
- Add telescope file initialization from existing loaded files
- Refactor plugin reload watcher to dynamically add/remove plugins on filesystem changes
- Add new plugins: file_history, extend_source_view_menu, godot_lsp_client
- Fix bug in prettify_json (undefined variable reference

plugins/code/event-watchers/extend_source_view_menu/__init__.py

@@ -0,0 +1,3 @@
+"""
+    Plugin Module
+"""

plugins/code/event-watchers/extend_source_view_menu/__main__.py

@@ -0,0 +1,3 @@
+"""
+    Plugin Package
+"""

plugins/code/event-watchers/extend_source_view_menu/manifest.json

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+{
+    "name": "Extend Source View Menu",
+    "author": "ITDominator",
+    "version": "0.0.1",
+    "support": "",
+    "requests": {}
+}

plugins/code/event-watchers/extend_source_view_menu/plugin.py

@@ -0,0 +1,29 @@
+# Python imports
+
+# Lib imports
+
+# Application imports
+from libs.event_factory import Event_Factory, Code_Event_Types
+
+from plugins.plugin_types import PluginCode
+
+from .source_view_menu import extend_source_view_menu
+
+
+
+class Plugin(PluginCode):
+    def __init__(self):
+        super(Plugin, self).__init__()
+
+    def _controller_message(self, event: Code_Event_Types.CodeEvent):
+        if isinstance(event, Code_Event_Types.PopulateSourceViewPopupEvent):
+            extend_source_view_menu(event.buffer, event.menu)
+
+    def load(self):
+        ...
+
+    def unload(self):
+        ...
+
+    def run(self):
+        ...

plugins/code/event-watchers/extend_source_view_menu/source_view_menu.py

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+# Python imports
+import json
+
+# Lib imports
+import gi
+
+gi.require_version('Gtk', '3.0')
+
+from gi.repository import Gtk
+
+# Application imports
+
+
+
+def on_case_handle(menuitem, buffer, action):
+    start_itr, \
+    end_itr  = buffer.get_selection_bounds()
+    data     = buffer.get_text(start_itr, end_itr, False)
+    text     = data
+
+    if action == "on_all_upper":
+        text = data.upper()
+    elif action == "on_all_lower":
+        text = data.lower()
+    elif action == "on_invert":
+        text = data.swapcase()
+    elif action == "on_title":
+        text = data.title()
+    elif action == "on_title_strip":
+        text = data.title().replace("-", "").replace("_", "").replace(" ", "")
+
+    buffer.begin_user_action()
+    buffer.delete(start_itr, end_itr)
+    buffer.insert(start_itr, text)
+    buffer.end_user_action()
+
+
+
+def extend_source_view_menu(buffer, menu):
+    if not buffer.get_selection_bounds(): return
+
+    for child in menu.get_children():
+        if not child.get_label() == "C_hange Case": continue
+        menu.remove(child)
+
+    change_case_item = Gtk.MenuItem(label = "Change Case")
+
+    case_menu        = Gtk.Menu()
+    au_case_item     = Gtk.MenuItem(label = "All Upper Case")
+    al_case_item     = Gtk.MenuItem(label = "All Lower Case")
+    inver_case_item  = Gtk.MenuItem(label = "Invert Case")
+    title_case_item  = Gtk.MenuItem(label = "Title Case")
+    title_strip_case_item = Gtk.MenuItem(label = "Title Strip Case")
+
+    au_case_item.connect("activate",  on_case_handle, buffer, "on_all_upper")
+    al_case_item.connect("activate",  on_case_handle, buffer, "on_all_lower")
+    inver_case_item.connect("activate", on_case_handle, buffer, "on_invert")
+    title_case_item.connect("activate", on_case_handle, buffer, "on_title")
+    title_strip_case_item.connect("activate", on_case_handle, buffer, "on_title_strip")
+
+    case_menu.append(au_case_item)
+    case_menu.append(al_case_item)
+    case_menu.append(inver_case_item)
+    case_menu.append(title_case_item)
+    case_menu.append(title_strip_case_item)
+    change_case_item.set_submenu(case_menu)
+
+    menu.append(change_case_item)