Make formatting settings in config file

[DarkwingDuck48]

Formatting settings

In current version (0.0.14) formatting of output excel file hardcoded in Rust.

Need to develope some config options to edit formatting on fly, when export running.

Base approach:
Create TOML config file with sections and parameters to formatting.

These could be:

• Base - applied to whole report (number formatting, fonts, etc)
• Simple rows - applied to simple rows section
• Table - applied to table part of reports.

In addition, sections could be separated on sheets in book.