Documentation page update

This version was introduced in #18 and includes only documentation changes. That is the update of the documentation page from https://shiftregister.simsso.de/ to https://timodenk.com/blog/shift-register-arduino-library/ and changes to the header comment of source code files.

C++ templates to avoid heap fragmentation

This version was contributed by lathoub in PR #17. The changes

• avoid using free/malloc as it causes heap fragmentation and crashes long term when repeatedly calling constructor/destructor (this modif avoids that),
• use uint8_t in stead of int (saving memory),
• use bitSet and bitClear functions instead of performing the bit manipulation manually.

Code clean-up, memory leak fix, progmem feature

Improvements can be found in PR #15, special thanks go to @Koepel. Summary:

• Add destructor (fixes memory leak)
• Add progmem feature
• Clean-up to code to rely on updateRegisters() everywhere

Library Manager compliant

• Add functionality to set pins without update (setNoUpdate) and update all pins at once (updateRegisters); pull request #4, thanks to @alecamaracm
• Add compliancy with Arduino Library Manager; issue #5
• Enhance and add comments

Stable release

Version 1.0 of the Shift-Register-74HC595-Arduino-Library. Detailed information can be found on the corresponding website: http://shiftregister.simsso.de/