v2.00 Riced out hostage down COLORS, cvars, admin visibility filter option

What's Changed

• Riced out with colors, cvars for all, and optional admin/vip only by @Ballganda in #1
• Revise README for HostageDown plugin by @Ballganda in #2

New Contributors

• @Ballganda made their first contribution in #1

Full Changelog: https://github.com/Ballganda/SourceMod-HostageDown/commits/V2.0

Original creators plugin: https://forums.alliedmods.net/showthread.php?t=60056

##Cvar List:
sm_hostagedown_enable "1" // Enable or disable the plugin
sm_hostagedown_prefix "HostageDown" // Text used in the prefix
sm_hostagedown_color_prefix "{green}" // Color of the [HostageDown] prefix
sm_hostagedown_message "killed a hostage!!!" // Message body text
sm_hostagedown_color_message "{pink}" // Color of the message text
sm_hostagedown_color_ct "{blue}" // CT player name color
sm_hostagedown_color_t "{red}" // Terrorist player name color
sm_hostagedown_color_none "{peachpuff}" // Spectator / unassigned color
sm_hostagedown_admin_only "0" // 0 = visible to everyone, 1 = admins only
sm_hostagedown_admin_flag "o" // Required admin flag(s) (default: custom1)

See morecolors mod for full color list.
https://forums.alliedmods.net/showthread.php?t=185016
https://github.com/DoctorMcKay/sourcemod-plugins/blob/master/scripting/include/morecolors.inc