Consistent shortcut modifiers

PasteToPicker 1.0.3 now uses Control–Option–Command–V by default, matching the modifier keys used by the other Spoons.

• Adds defaultHotkeys for SpoonInstall and a no-argument bindHotkeys() default.
• Keeps explicit custom shortcut mappings supported.
• Updates setup examples and the installable package.

PersonalSafari 1.0.2 and SafariTabGroups 1.0.0 are unchanged. All included Lua checks pass. Existing users with an explicit binding should add alt to that mapping or call bindHotkeys() without arguments.