decoder.cpp:145-148: Implement processing of 0b0001111...

[0pdd]

The puzzle 39-226025d4 from #39 has to be resolved:

BESM-666/src/decoder/decoder.cpp

Lines 145 to 148 in e27fed8

	* @todo #39:90min Implement processing of 0b0001111 opcode.
	* According to the new specification
	* https://raw.githubusercontent.com/riscv/riscv-isa-manual/8176af1a46bfe2e15f8cdb170d74e52e1ba6efa2/src/rv-32-64g.adoc
	* there are not FENCE only but also FENCE.TSO and PAUSE with

The puzzle was created by @levBagryansky on 26-Sep-23.

Estimate: 90 minutes, role: DEV.

If you have any technical questions, don't ask me, submit new tickets instead. The task will be "done" when the problem is fixed and the text of the puzzle is removed from the source code. Here is more about PDD and about me.

[0pdd]

@c71n93 @mmamayka @levBagryansky please pay attention to this new issue.