ToolTipHandler: listen to a Control's dispose event & trim the Tooltip list rather than just adding new tooltip without limit.
ToolTabs.cs: fix https://github.com/ZeroK-RTS/Zero-K-Infrastructure/issues/222 & also make Tooltip appear on Linux for the Chat channel list.

"MouseOver" event doesn't seem to be called for the ToolStrip button, must use "MouseEnter" and/or "MouseLeave".
BattleBar.cs: fix https://github.com/ZeroK-RTS/Zero-K-Infrastructure/issues/217 by saying "New report arrive at zkadmin channel" and point at chat/zkadmin when receiving Rang from Nightwatch (if receiving Rang from somebody else, will use default message pointing at chat/Battles)
HeadlessTab & Navigation Control: make Nav buttons & the Content window to have clean precise fit (no chat window appearing under Back or Forward button)