Support running phar archives with no ext-phar

[clue]

Always embed phar extractor into phar archive. This allows the phar file to be run even in environments without ext-phar.

This increases uncompressed file size by about 6 KiB, compressed file size by about 2 KiB. The below table shows some example file sizes with one of the smaller phar archives generated. Imo the increase in file size in negligible in contrast to how big most phar archives are.

Package	Normal Size	Size with Extractor	Size delta	Size delta%
clue/psocksd.phar	660,1 KiB	666,5 KiB	+6,4 KiB	+0,97%
clue/psocksd.phar.gz	144,0 KiB	146,0 KiB	+2,0 KiB	+1,39%
clue/psocksd.phar.bz2	110,5 KiB	112,2 KiB	+1,7 KiB	+1,54%

Fixes #6

[clue]

For now, we will not add an option to toggle this feature. It vastly improves portability for legacy setups and its increase in file size is negligible.