MP Force Resync button

[seroperson]

Still there are some things to do, but I will back for it a little bit later. Until merging I also want to:

• somehow set some appropriate icon for the button. Maybe there are some suggestions which icon can I re-use for such button?
• do some UI tweaks, such as disabling button if desync is already scheduled, some notification on click and so on.
• re-check whether I set all the #if defined things. Am I used them properly at all? Do we need to completely cut all the definitions or cutting only bodies is enough? Do we need to use #if defined or plain if?
• support DX9 binary (I'm unsure about Tablet, I think we can just skip it for now).

Confirmed working like a charm (at least during my brief test session).

[seroperson]

Copied from UI_bc1

[seroperson]

Pushed new changes:

• Appropriate icon
• Dynamically hide/show, disable/enable button
• Chat notification when desync was scheduled
• Removed if defined things, replaced with plain if
• Rebase on current master

Seems ready to merge, BUT ... looks like something changed internally since I implemented it and now resync completely breaks the game for non-host players. I'm unsure whether only my force resync is broken or the usual is broken too in v4+, but I assume the second case.

Here is how it looks like:

(maybe someone knows what's wrong here)

So, delaying the merge until this thing is resolved.

edit: Yea, seems like resync is totally broken in v4+ (#10439)

[seroperson]

@RecursiveVision Fixed broken resync by removing this gDLL->BeginSendBundle part because there is already such logic after setGameStarted in closeInactiveSlots(). Also I moved gDLL->sendPlayerInfo(eID) outside of slotStatus(eID) == SS_OPEN block to send all the info to be sure. Maybe it is redundant, but seems like it works and let it be so at least for now, we will back for it in case of any issues.
Tested resync and loading from savefile + resync, works ok.

Button appears just for EUI DX11 host. Any other configurations are unsupported for now.