[v0.2.1] Instr/Sample Name Length

[bazz1tv]

Starting on v0.2.1, the instrument and sample name lengths have been reduced. However, if an older song file is loaded that uses more than the current string maximum length, the display overflows.

Easy Fix: When loading files, make sure we load no more than the display limit into the instr/sample string names.
Hard Fix: More complex TextEditRect to allow editing longer strings, while only displaying limited visibility into them.