Fix push_matrix, drop pop_matrix and pop_style #157
Merged
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This removes pop_matrix() and pop_style(), which were unnecessary (push_matrix and push_style are context managers) and were incorrectly implemented.
It also corrects all the bad documentation and example code, which was incorrectly demonstrating push_matrix as a non-context manager (wrong) followed by pop_matrix (wrong, shouldn't be used). This includes narrative explanations from the 2D tutorial.
Closes #156
Resolves #147