Python: Added support for file_identifiers (#5123)

* Python: Added support for file_identifiers

* Added tests. Fixed file_identifier code.

* Python: Fixed excessive padding of file_identifier. Repaired tests.

* Python: Made code compatible with python2.7

* Python: Typo fix in @endcond

* whitespace normaalization

* Stylistic change from if(not X is None) to if(X is not None). Added comment to type string.

* Python: Added support for automatic code generation of file_identifiers. Added tests for said code generation.

* converted sprintf to snprintf

* Bugfix, added snprint deffinition for MSVC

* changed snprint deffinition for MSVC to sprint_s

* changed scanf to IntToStringHex. Renamed HasFileIdentifier to GenHasFileIdentifier.

* Added updated genereated code to commit

* Python bugix: flatc no longer produces HasFileIdentfier for shcemas with no file identifier

* Added tests to verify `MonsterBufferHasIdentifier` returns false on no Identifier

* Python: added tests for GetBufferIdentifier and BufferHasIdentifier
Python: removed unessasary parenethesis in if statements
Minor format changes.

* Python : correceted instances of keyword arguments being called as positional arguments

* fixed typos and grammer in comments

* Minor style fixes

* Indentation fix

* Equals style changes

* Python: Fixed Alignment Issues. Changed test code to test against atual output

* Ran make(forgot to run make last commit)

* Python: Style changes

* Style changes

* indentation and style

* readded CONTRIBUTING.md

* Formatting tweak

Mostly to make CI run again

* More formatting fixes

* More formatting fixes

* More formatting fixes

* More formatting fixes

* Formatting fix

* More formatting fixes

* Formatting

* ran generate_code.sh

tests/MyGame/Example/ArrayTable.py

@@ -14,6 +14,10 @@ class ArrayTable(object):
         x.Init(buf, n + offset)
         return x
 
+    @classmethod
+    def ArrayTableBufferHasIdentifier(cls, buf, offset, size_prefixed=False):
+        return flatbuffers.util.BufferHasIdentifier(buf, offset, b"\x41\x52\x52\x54", size_prefixed=size_prefixed)
+
     # ArrayTable
     def Init(self, buf, pos):
         self._tab = flatbuffers.table.Table(buf, pos)