Markup corrections

Doc fixes, tag 0.7.3

Spelling, clarification.

History prepared for release with Teensy 4.0 support.

Merge pull request #18 from muwerk/no_read_modify

No read modify PR by mzanetti

Merge pull request #14 from muwerk/inline

Inline global operator new and global functions to support multiple includes

0.6.1 tag

Doc fix

Merge pull request #9 from muwerk/hotfix/arduinonames

Hotfix/arduinonames

0.4.4 [0.4.3 skipped because of inconsistent numbering betw. arduino …

…and platformio at last release