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Fixed issue that prevented sub-php8 users from running lib, and added github actions.

Addresses issue that prevented sub php8 users from utilizing lib, and added github actions runner

Addresses #73.

• Add very small compatibility layer for newer psr/log versions
• Remove dependence on myENA package(s).

Addresses #73.

• Add very small compatibility layer for newer psr/log versions
• Remove dependence on myENA package(s).

The v3.x development addressed an where decimal precision was not retained between unserialization -> serialization. This release backports that fix into the v2.x series of releases.

Improves compatibility with external libraries and frameworks by no longer globally forcing errors to exceptions.

A template syntax error caused the _writeToFile method present on FHIRBase64Binary to be commented out. This has been corrected.

All types now have basic validation methods _getValidationErrors() and _getValidationRules(). These are based on constraints found in parsing the definition xsd's, and should only be used as guide as many providers deviate from the spec constraints.

• Types that have {name} and _{name} entries in their json representation will now be constructed if either / or are present.
• Class properties that are not FHIR values are private once again
• The JSON portion of the generated phpunit tests now assert equivalency between the original representation and the re-encoded version after going through the unmarshal -> marshal routine
• Constructors are now a little bit cleaner, and hopefully easier to read.
• Minor other improvements.

Some minor improvements focused at DSTU1 and DSTU2 types that extend primitive types