Tape loading and control tests

[Vladyslav Nikonov]

In scope of this task the following tests should be added to the rustzx-test suite:

• Create simple multi-block tape (loader block + screen file block should be enough)
• Fast loading of the standard blocks (autoload can be enabled to eliminate need for user input emulation for this test).
• Normal tape loading (disabled autoload and fastload) + check border contents
• Normal tape loading for 128K
• Tape additional controls test - stop and rewind