Fix multi-select word movement for snake_case and add Ctrl+scroll zoom

- Implement snake_case-aware word movement that treats underscores as part of words
- Fix selection edge detection to only move when caret is at appropriate boundary
- Add INSERT state guards to line_up/down commands
- Add Ctrl+scroll zoom in/out functionality for text size
- Remove obsolete newton.zip archive

TODO.md

@@ -4,7 +4,6 @@ ___
 1. Add TreeSitter
 1. Add Collapsable code blocks
 1. Add Terminal plugin
-1. Add <Ctrl>mouse scroll to zoom text in/out
 1. Add event to emit on file open so plugins could try to open
 1. Add Plugin to <Shift\><Ctrl\>| and <Ctrl\>| to split views up, down, left, right
 1. Add <Ctrl\>i to **lsp_manager** to list who implements xyz
@@ -17,7 +16,5 @@ ___
 ___
 ### Fix
 - Fix on lsp client unload to close files lsp side and unload server endpoint
-- Fix multi-select <Shift\><Ctrl\> left/right block select movement de-sync
-       from leader when '_' in word
 
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