#59 A new format for increment feature

[drsss]

Add a new format in the Bulk Rename window for renaming with increment feature.
For exemple :
(left) ^ (right) %1_
file -> 1_file
file -> 2_file
etc.

(left) ^ (right) %001_
file -> 001_file
file -> 002_file
etc.

(left) ^ (right) %5+01_
file -> 05_file
file -> 06_file
etc.

(left) ^ (right) %10+005_
file -> 010_file
file -> 015_file
file -> 020_file
etc.

Cordially,
I love Rox-Filer