Fix of issue with the build

+The optional property drawer class used in Editor is not available in build, but was still included in compilation which resulted in build error

Update README.md

Update README.md

Documentation, fixes, improvements

+Documentation update
+Fixed edge case when rewinding oldest value
+Properly supporting change of Time.timeScale at any point
+Cleaned CircularBuffer class
+Fixed unecessary memory usage even when user didnt opt to track certain attributes

Documentation update

Update README.md

Rigidbody 2D

+System now correctly tracks velocities of both Rigidbody and Rigidbody 2D

Fixed execution order issue

+Fixed issue with execution order when placing new element to track, that required Unity to be restarted
Interesting note: OnEnable() of RewindAbstract.cs was actually called before Awake() of RewindManager.cs which is apparently not a bug: https://issuetracker.unity3d.com/issues/awake-function-called-after-onenable

Workflow simplification, documentation update, code cleaning

+Added more summaries in code
+Improved Animator rewind method
+Changed and simplified custom variable tracker implementation (AdditionalRestore() and AdditionalReset() not required anymore)
+Timescale is now changeable (although not in runtime)
+Cleared scripts from unnecessary references
+Changed the method name from GetSnapshotFromSavedValues() to Rewind()
+Circular buffer have exposed methods working directly in seconds so the position doesnt need to be calculated anymore
+Simplified RewindAbstract class
+Now also tracking the active state of audiosource
+Updated documentation (More important sections added)

Fixed dinosaur animator transition in demoscene