Replicate htop's process list/tree options

[singalen]

Describe the feature request

What is the feature of interest? Be clear and concise.

htop has a bunch of coloring features that make navigating a large process tree easier:

• "Shadow other users' processes": draw them in a more dim gray color;
• "Hide kernel threads" (on by default): only show userspace threads/processes;
• "Hide userland process threads": only show processes;
• "Display threads in a different color": helps distinguish threads and only pay attention to processes;
• "Show custom thread names": useful when processes care to set meaningful thread names;
• "Show program path" - helps to locate the exact executable for a process;
• "Highlight program "basename": really helps with a mile-long commands;
• "Update process names on every refresh": probably useful for processes that do exec().

Additional context/details

I hope the option names are self-explanatory and the demand for them proven by their existence in htop. Sorry for partially duplicating #228.

[fosskers]

Especially hiding kernel threads and highlighting base names.

[rallyram]

htop's can also show a processes' open file handles, which can be handy