Add global Parameters hotkey and hotkey label updates

[matijaerceg]

What changed

• Added a new Global Hotkeys menu entry: Parameters...
• Added default Parameters hotkey: Ctrl+Shift+P
• Wired Parameters into the existing global hotkey flow:
  • editable in Processing -> Global Hotkeys
  • persisted/restored with other hotkeys
  • registered/unregistered with global hotkey enable state
  • handled in WM_HOTKEY dispatch
• Updated IDM_SHADER_PARAMETERS behavior to toggle the Parameters window (show/hide) instead of always showing
• Updated Global Hotkeys submenu labels to show current assignment for each entry in parentheses, e.g. (Ctrl+Shift+P) or (None)

Validation

• Built and ran on Windows (Release x64)
• Verified Processing -> Global Hotkeys -> Parameters... can be edited and saved
• Verified Ctrl+Shift+P toggles the Parameters window open/closed
• Verified behavior when Global Hotkeys is enabled/disabled matches existing hotkeys
• Verified clearing a hotkey shows (None) and disables that trigger
• Verified assignments persist across app restart

Note: ShaderGlass/ShaderGlass.rc is UTF-16 (standard for this project), so GitHub may render it as binary.
Text diff for this file is:

@@ -56,6 +56,7 @@
             MENUITEM "Capture Cursor...",           ID_GLOBALHOTKEYS_CURSOR
             MENUITEM "Start/Stop...",               ID_GLOBALHOTKEYS_PAUSE
             MENUITEM "Toggle Menu...",              ID_GLOBALHOTKEYS_SHOWMENU
+            MENUITEM "Parameters...",               ID_GLOBALHOTKEYS_PARAMETERS