Add strict concurrency checks for Swift 6 support and fix concurrenc……y warnings in tests (#130)* Add checks for Swift 6 support and fix concurrency warnings* Update .devcontainer/devcontainer.jsonCo-authored-by: Tim Gymnich <tim@gymni.ch>---------Co-authored-by: Tim Gymnich <tim@gymni.ch>

Android support (#128)* Android support* Add Android CI* Update Android CI* Run Android CI on macos-13* Run Android CI on macos-13

Fix Internal _mantissa problem on Windows (#125)

improve Decimal conversion performance using `_mantissa` (#124)* improve Decimal conversion performance using `_mantissa`* fix linux builds by keeping the decimal string init in a compiler directive* more efficient zero out assurance after buffer creation* Decimal (from bigint) initializer

Decimal and Foundation (#122)* add CustomDebugStringConvertible* reduce Foundation dependency* if foundation is available, add Decimal functionality* more concise floating point init* dry up data initialization

Revert docc related changes from "Migrate from xcworkspace to swift p……ackage (#119)"This reverts the docc related changes in commit5f01bdc.

fix links

Bumped version