Fixes #124 , Fixes #139 - Refactored `BasicBufferTestSuite` and moved base64 tests to new `BasicBase64TestSuite`

[Indibulous]

Split the 12 existing facts in BasicBufferTestSuite into 41 new ones:

• buffer_exists_test
• buffer_get_type_test
• buffer_get_alignment_test
• buffer_get_size_test
• buffer_get_address_test
• buffer_tell_test
• buffer_seek_test #1
• buffer_seek_test #2
• buffer_seek_test #3
• buffer_resize_test
• buffer_delete_test
• buffer_fill_test #1
• buffer_fill_test #2
• buffer_crc32_test
• buffer_md5_test
• buffer_sha1_test
• buffer_base64_encode_test
• buffer_base64_decode_test
• buffer_base64_decode_ext_test
• buffer_compress_test
• buffer_decompress_test
• buffer_poke_test
• buffer_write_test #1
• buffer_write_test #2
• buffer_read_test #1
• buffer_read_test #2
• buffer_sizeof_test
• buffer_get_surface_test
• buffer_set_surface_test
• buffer_create_from_vertex_buffer_test
• buffer_create_from_vertex_buffer_ext_test
• buffer_copy_from_vertex_buffer_test
• buffer_save_test
• buffer_save_ext_test
• buffer_load_test #1
• buffer_load_test #2
• buffer_load_ext_test
• buffer_load_partial_test
• buffer_save_async_test
• buffer_save_async_group_test
• buffer_load_async_test

And put some repeated code into functions, added comments, and modified assert descriptions.

Also split the base64_test fact into 14 seperate facts:

• base64_encode_test #1
• base64_encode_test #2
• base64_encode_test #3
• base64_encode_test #4
• base64_encode_test #5
• base64_encode_test #6
• base64_encode_test #7
• base64_encode_test #8
• base64_decode_test #1
• base64_decode_test #2
• base64_decode_test #3
• base64_decode_test #4
• base64_decode_test #5

• base64_decode_test #6

  And moved them into a newly created BasicBase64TestSuite.