initial commit: gd-controls plugin scaffolding

- promptfont font assets and license
- key_mapping CSVs for Godot input bindings and prompt-font glyphs
  across keyboard/mouse, PC/Xbox/Sony/Nintendo controllers, and touch
- gen.py generates prompt_font_mapping.gd from key_mapping/promptfont.csv,
  splicing between STARTGEN/ENDGEN markers
- device, manager, file_manager scaffolding (work in progress)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fonts/promptfont/promptfont.otf.import

@@ -0,0 +1,36 @@
+[remap]
+
+importer="font_data_dynamic"
+type="FontFile"
+uid="uid://cghf1fy60knvy"
+path="res://.godot/imported/promptfont.otf-b6ba09760ea41d2b073d643b500ef004.fontdata"
+
+[deps]
+
+source_file="res://addons/gd-controls/fonts/promptfont/promptfont.otf"
+dest_files=["res://.godot/imported/promptfont.otf-b6ba09760ea41d2b073d643b500ef004.fontdata"]
+
+[params]
+
+Rendering=null
+antialiasing=1
+generate_mipmaps=false
+disable_embedded_bitmaps=true
+multichannel_signed_distance_field=false
+msdf_pixel_range=8
+msdf_size=48
+allow_system_fallback=true
+force_autohinter=false
+modulate_color_glyphs=false
+hinting=1
+subpixel_positioning=4
+keep_rounding_remainders=true
+oversampling=0.0
+Fallbacks=null
+fallbacks=[]
+Compress=null
+compress=true
+preload=[]
+language_support={}
+script_support={}
+opentype_features={}