Fix thread and process widget API usage to match dpT and dp behavior.

[karliss]

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Detailed description

Use same API as dpT and dp, for listing threads and processes. I am guessing that either there was a mistake during rizin command->C API migration or the behavior of rizin functions slightly changed.

Improve the content of thread widget -> add PC and TLS columns, with the usual address context menu.

Test plan (required)

Test all process list:

• open any executable
• Debug/Attach
• should see list of all currently running processes

Test threads:

• open executable which will spawn multiple threads
• start debugging
• continue until threads are created
• pause
• inspect thread widget -> should display the threads, compare against dpT and external task manager
• switch between threads by double clicking, make sure that position in disassembly view matches displayed PC of selected thread
• right click on one of PC cells -> make sure correct address is used
• right click on one of TLS cells -> make sure correct address is used
• open process widget -> the threads shouldn't be displayed as processes

Test process widget

• open /usr/bin/stress
• start debugging with --cpu 2 arguments
• continue until child processes are spawned pause if necessary, in my case cutter automatically paused when new process was created
• inspect process widget -> should display 3 processes

Closing issues

Closes #3409

Related #1859