Sync has been around for a while, so reflect that.
s/Uses/Use/
s/Shows/Show/
Make the beginning of the descriptions consistent.
Consistency in how highlighters are described.
Return to previous description, it is better.
Merge pull request #710 from nexushoratio/proofreading

Number of changes to plugin descriptions, mostly for consistency.
compute-ap-statistics: updated for the api changes
players-resonators plugin: permanant removal due to lack of data
portal-defense plugin: permanant removal