* [Core] Add Boolean Functions to expressions (AND, OR, BOOL, NOT)
* [Core] Add `if` function to expressions to overcome ternary operator limitations
* [Core] Update expressions grammar to recognize relational operations as arguments
* [Core] The `if` function has been removed as no consensus was reached regarding its convenience or necessity. Its inclusion was considered potentially confusing or redundant.
* [Core] Make boolean cast based on Confusion threshold.
Rename files according 7d233dc ("Gui: Rename generated lexer files
to match core naming pattern"). Note that C space errors (space
before tabs, spaces on blank lines, etc.) still need to be fixed
manually after regenerating lexer file.
