fix Greek dead key terminator (Ω→α), enable CapsLock language switch, fix parser key resolution

- change Greek dead key terminator from Ω to α in all layout versions,
  matching the official EurKEY spec (closes #11)
- change dead key state name from "dead: Ω" to "dead: α" in v1.2/v1.3
- enable TICapsLockLanguageSwitchCapable in build script (closes #8)
- fix parser to resolve all key codes from base keyMapSets, not just
  codes in explicit layout entry ranges
- add per-version exceptions for newly-discovered v1.2/v1.4 differences
- add Karabiner-Elements docs section, known issues section to README
- add Windows spec installers for reference
- regenerate all parsed JSON specs with fixed parser

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

EurKey-macOS.bundle/Contents/Resources/EurKEY v1.4.keylayout

@@ -1762,7 +1762,7 @@
         <when state="3" output="`"/>
         <when state="4" output="¬"/>
         <when state="5" output="˚"/>
-        <when state="6" output="Ω"/>
+        <when state="6" output="α"/>
         <when state="7" output="^"/>
         <when state="8" output="¨"/>
         <when state="9" output="´"/>