Add more placeholders. Fix versioning bug in plugin.yml
I mistakenly pushed the 2.5.10 version out without updating the plugin.yml version. This was causing some oddities with my update checker. I've fixed that issue with this version.
Furthermore, I have added two new placeholders:
%tokensplus_tokens_commas%: Gives token amount for player separated by commas (e.g., 1200 -> 1,200)
%tokensplus_tokens_formatted%: Gives token amount for player with the appropriate single-character suffix (e.g., 1200 -> 1.20K)