GracePlugin

### New Features

#### Commands

- Added `/grace stop` command to manually stop an active grace period

- Added `/grace start [duration]` command with optional duration parameter in seconds

- Added `/grace delete <regionName>` command to remove existing regions

- Added `/grace list` command to display all created regions

- Added `/grace info <regionName>` command to view detailed region information including all flag states

- Added `/grace setflag <regionName> <flag> <true|false>` command as an alternative syntax for setting region flags

- Added full tab completion support for all commands, subcommands, region names, flag names, and boolean values

#### Configuration

- Added `default-flags` section in config.yml allowing server admins to configure the default state of each flag

- All flags now default to `true` (enabled) when not explicitly set

- Added `grace-stopped` message configuration option

- Flags can now be pre-configured before the plugin loads

#### Permissions

- Added `grace.stop` permission for stopping grace periods

- Added `grace.delete` permission for deleting regions

- Added `grace.list` permission for listing regions

- Added `grace.info` permission for viewing region information

#### Quality of Life

- Status command now displays the state of all global flags

- Help menu now only shows commands the player has permission to use

- Time formatting now includes hours for longer durations

- Improved feedback messages with color coding for flag states

- Region creation now validates that both corners are in the same world

- Region creation now checks for duplicate region names

- Added helpful hints after command execution

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### Bug Fixes

#### Combat and Damage

- Fixed projectile damage (arrows, tridents, etc.) not being blocked during grace period

- Fixed invincible-players flag logic being inverted

- Fixed PVP checks not properly considering per-player grace status

- Fixed mob damage flag not applying correctly in some situations

#### Grace Period Management

- Fixed grace period not properly ending when time expires

- Fixed boss bar progress calculation going negative or above 100%

- Fixed paused grace time not being calculated correctly when resumed

- Fixed grace period persisting across server restarts incorrectly

- Fixed auto-start not finding valid worlds when worlds section is missing

#### Per-Player Grace

- Fixed personal grace period not starting for new players

- Fixed players receiving duplicate grace start notifications

- Fixed personal grace expiry check not removing expired entries

- Fixed extra life feature not properly preserving inventory and experience

#### Deathban System

- Fixed deathban not properly kicking players after the delay

- Fixed spectator mode not being applied before deathban kick

- Fixed IP ban using incorrect method

- Fixed deathban ignore permission not being checked correctly

#### Regions and Flags

- Fixed region flag values not being read correctly from grace.yml

- Fixed global flags not loading default values from config

- Fixed command blocking flag logic being inverted

- Fixed flight not being disabled when leaving a flight-allowed region

- Fixed null pointer exception when checking regions in unloaded worlds

#### General

- Fixed cooldown messages being sent too frequently

- Fixed null pointer exceptions when items have no metadata

- Fixed region selection tools not being recognized after relog

- Fixed mob spawning flag blocking custom/plugin spawns

- Fixed movement event firing on head rotation without position change

- Fixed configuration not reloading all values on `/grace reload`