Crash Fixes

* Removed readscan.cs's use for Regex weirdness and made it ignore empty
lines totally
* Fixes crash on save dialog cancel
* Removed my failed crash prevention from
clipboardToolStripMenuItem_Click() (was moved to readscan.cs)
* Moved openfilediag() up other openToolStripMenuItem_Click()
* Added same check to textFileToolStripMenuItem_Click() as I did for
clipboardToolStripMenuItem_Click()