Added operator tests for hide, symmetry_snap, tris_convert_to_quads, uvs_rotate, uvs_rotate, uv_texture_add, uv_texture_remove, vert_connect_concave, vert_connect_nonplanar, vertex_color_add, vertex_color_remove, vertices_smooth_laplacian, wireframe, sculpt_vertex_color_add and sculpt_vertex_color_remove.
New .blend
I tried to add tests for subdivide_edgering, but found that the operator returned inconsistently, with the generated vertexes having different ordering each time, and had some weirdness with the generated vertexes not being selected after the operator, causing the test to fail. The geometry and code is included for the tests, but is commented out, so it's there if it gets fixed.
Part of T84999
