Extreme performance & styles enhancements

• New async mode for compression and increase performance about 35%
• Complete values for Border styles and Fill patterns
• Color structure replaced with System.Drawing.Color to simplify api
• Utf8 strings support
• String encoding optimizations

1.4.0

New Feature

• Add support for pictures.

Improvement

• Optimize string writing

collect shared strings during file building

Merge pull request #3 from gooseberrysoft/feature/shared_string_refac…

…toring

add shared string writing

fix alias writing

fix alias writing

add showGridLines sheet configuration

add showGridLines sheet configuration

Add hyperlinks

• add hyperlinks
• fix problem in string cell writing

Add shared strings

1.1.0

change version

add cancelation token

add cancelation token

initial release

1.0.0

Merge remote-tracking branch 'origin/main' into main