Moved plugins and refactor command system

- Moved plugins to apropriate sub folders
- Refactor command system with new add_command method and rename GetCommandSystemEvent to GetNewCommandSystemEvent
- Add RegisterCommandEvent for dynamic command registration
- Change footer container orientation to VERTICAL
- Add search-highlight tag to source buffer
- Add file change detection (deleted, externally modified) in source_file
- Add JSON prettify option to source view popup menu
- Enable hexpand on VTE widget
- Update plugins_controller_mixin to use widget_registry

plugins/code/search_replace/mixins/search_mixin.py

@@ -0,0 +1,79 @@
+# Python imports
+from contextlib import suppress
+
+# Lib imports
+import gi
+gi.require_version('Gtk', '3.0')
+from gi.repository import Gtk
+
+# Application imports
+
+
+
+class SearchMixin:
+    def is_word_char(self, ch):
+        return ch.isalnum() or ch == "_"
+
+    def is_whole_word(self, start_itr, end_itr, buffer):
+        if start_itr.backward_char():
+            prev_char = start_itr.get_char()
+            if self.is_word_char(prev_char):
+                return False
+
+        # if end_itr.forward_char():
+        #     next_char = end_itr.get_char()
+        #     if self.is_word_char(next_char):
+        #         return False
+        next_char = end_itr.get_char()
+        if self.is_word_char(next_char):
+            return False
+
+        return True
+
+
+    def _find_all_matches(self, search_text, buffer):
+        self.matches.clear()
+        self.current_index = -1
+
+        start_itr   = buffer.get_start_iter()
+        end_itr     = buffer.get_end_iter()
+
+        case_mode   = Gtk.TextSearchFlags.CASE_INSENSITIVE if not self.mode_bttn_box.match_case else Gtk.TextSearchFlags.TEXT_ONLY 
+        whole_word  = self.mode_bttn_box.whole_word
+        if self.mode_bttn_box.in_selection:
+            with suppress(Exception):
+                start_itr, end_itr = buffer.get_selection_bounds()
+
+        while True:
+            match = start_itr.forward_search(
+                search_text,
+                case_mode,
+                end_itr
+            )
+
+            if not match: break
+
+            match_start, match_end = match
+            if whole_word and not self.is_whole_word(match_start.copy(), match_end.copy(), buffer):
+                start_itr = match_end
+                continue
+
+            self.matches.append(
+                (match_start.copy(), match_end.copy())
+            )
+
+            start_itr = match_end
+
+    def _highlight_all_matches(self, buffer):
+        self.clear_highlight(buffer)
+
+        for start_itr, end_itr in self.matches:
+            buffer.apply_tag(self.highlight_tag, start_itr, end_itr)
+
+    def _search_for_next_word(self, buffer):
+        self.current_index = (self.current_index + 1) % len(self.matches)
+        self._highlight_current(self.current_index, buffer)
+
+    def _search_for_prev_word(self, buffer):
+        self.current_index = (self.current_index - 1) % len(self.matches)
+        self._highlight_current(self.current_index, buffer)