Update to work with PHP 8.4 and allow more customization

[djyotta]

Improvements

• added a checks.ini config file
• allow for check number lower than 1000 by left padding numbers to 4 digits
• added ability to customize deposit line
• added ability to print a border as a cutting guide (good for when using plain office paper with no perforations)

NOTE: if using any "special" characters (anything other than 7-bit ASCII), then be sure to encode your checks.ini file as CP-1252 and not UTF-8 as the underlying FPDF library doesn't support UTF-8

Non-functional changes

• move fonts into lib/font which (if present) is searched for fonts by both FPDF and tFPDF.
  • this facilitates switching between master and the unicode suport branch I am working on: https://github.com/djyotta/checks/tree/unicode
  • I have unicode support working - still working on getting like-for-like libre fonts though

[djyotta]

I like the dollar sign to be pre-printed even when amount is empty