Crude support for decimal coordinates in X/Y, I/J
Support tool definitions that are zero padded eg T01 = T1
Allow drill decimal format to be passed in via gerber-to-svg options
Fix tests broken due to change in Plotter constructor
Test for custom drill format
Parse drill decimal format from comments if specified

Altium is an example of a tool that specifies the decimal format in
comments, and by default exports a different format than the standard
excellon format
Test for parsing decimal format from comments
Tests for zero padded tool names in drill files
Merge branch 'bug/tool-definition-zeros'
Merge branch 'feat/custom-drill-format'
Merge branch 'feat/parse-drill-format'