Rename cryptically named functions and variables

[Darylgolden]

Enhancement proposal

Manim is filled with cryptically named functions and variables. Some examples include pointwise_become_partial and digest_args. Such unhelpful names significantly lower code readability and is a major obstacle to understanding the internals of Manim. They should be renamed so that their role or purpose is, as far as possible, clear from first glance.

Additional comments