Avoid failing to process a message if one regex fails

[Krinkle]

When processing an event from RCReader, and one of the regexes on the BES is for some reason corrupt, we currently throw and not catch it until the outer try/catch from RCReader.rcirc_OnChannelMessage which then decides to ignore the message and move on.

Oct 13 00:04:19 cvn-app8 CVNBot.exe[8766]: ERROR [RCReader] CVNBot.RCReader Failed to handle RCEvent

System.ArgumentException: parsing "(?:A[^\A-z0-9]N[^\A-z0-9]A[^\A-z0-9]N[^\A-z0-9]I[^\A-z0-9]Z[^\A-z0-9]I|__ping__:Vito-Genovese, HakanIST)" - Unrecognized escape sequence \A.
at System.Text.RegularExpressions.RegexParser.ScanCharEscape ()
at System.Text.RegularExpressions.RegexParser.ScanCharClass (..)
at System.Text.RegularExpressions.RegexParser.CountCaptures ()
at System.Text.RegularExpressions.RegexParser.Parse (..)
at System.Text.RegularExpressions.Regex..ctor (..)
at System.Text.RegularExpressions.Regex.IsMatch (..)
at System.Text.RegularExpressions.Regex.IsMatch (..)
at CVNBot.ListManager.matchesList (System.String title, System.Int32 list) 
at CVNBot.Program.ReactToRCEvent (CVNBot.RCEvent r)
at CVNBot.RCReader.rcirc_OnChannelMessage (System.Object sender, Meebey.SmartIrc4net.IrcEventArgs e)

Instead, we should catch these within ListManager.matchesList and just return false, the same way as if the regex was working but didn't match (which is the most common case).

[Krinkle]

Pushed out a fix on the experimental 1.22.0-alpha branch for Mono 4, which is what CVNBot12 (cvn-wp-nl) currently runs on.