[TxMt] show invisibles, Perl, drag bug

1. Here is my attempt to hack a 'show invisible characters' capability. I made a syntax bundle called 'Show Invisibles' that colors spaces, tabs and ASCII characters below \x21 and above \x7F different colors. I posted the bundle to my web site at http://math.sfsu.edu/hsu/textmate. Install it and switch to as a syntax highlighting to find the gremlins.

2. I also updated my Perl bundle to have auto-indent and to highlight file test operators. Other changes noted on history page.

3. I think this has been mentioned, but when one drag-selects past the top or bottom of a window, usually the window should scroll in that direction, and TM 1.0.2b5 isn't doing that.

- Eric