Add CharsetEncoder.Finish()

[TroyNeubauer]

Add CharsetEncoder.Finish() to allow for esc4 and esc6 to use strings that have a character count that doesnt exactly match a complete word count. Ie odd numbered strings for esc4 and strings that arent a mutiple of 4 for esc6

[TroyNeubauer]

Empire-Serialization-2/C++/include/EmpireSerialization/Charsets.h

Line 250 in 386e103

ErrorCode WriteWord(ClassName::WordType word); \