feat: full syntax highlights and interactive compiler error reporting indicated using a red squiggly line under the affected symbols.

[paxcut]

• Added an under-squiggled text function to imgui extensions.
• Syntax highlighter supports identifier validation and attempts to use contextually invalid identifiers results in error denoting coloration.
• Moved shortcuts from text editor to shortcut manager in view_pattern_editor.cpp.
• Removed all the language definition code.
• Added a text preprocessing function to remove /t and use standard newlines.
• Changed uses of int and unsigned to i32 and u32 or equivalent.
• Changed theme files to use the new names for the color palette entries, but they should remain the same for the most part. - Added a full syntax highlighting theme for pattern language based on the previous Dark theme and clion's darcula which is called Clark
• Search-replace in pattern editor retained found matches when text was edited.
• Incorporated blinking cursor resetting to new functions that move the cursor and streamlined previous entries under mouse editing.

[paxcut]

Note that this changes won't compile until the latest pattern language submodule pr that i submitted is merged and the pattern language submodule is updated in imhex to use the merged code.

[paxcut]

I am turning this one into a draft as well as it is being implemented as a set of smaller PRs for the sake of easier reviewing. Once the set is complete I'll close it but I want to keep it around so I can make sure everything was included.