Allow process tree to work with more data sources.

[ianhelle]

• Removed the follow columns previously marked as required: host_name, logon_id, user_name, cmd_line.
• Added auto-coloring by level if no legend is supplied.
• Fixed sorting so that tree and peer groups in the tree are sorted by level, then timestamp.
• Added ability to supply schema as dictionary for vis.process_tree and transform.

Reduced required column set

This allows you to use the process tree visualization and utilities with a minimal set of data fields:

• process_id
• parent_id
• process_name
• time_stamp

    cust_schema = {
        "process_name": "ImageFileName",
        "process_id": "PID",
        "parent_id": "PPID",
        "time_stamp": "CreateTime",
    }
    df.mp_plot_process(schema=cust_schema)

Auto-coloring of tree plot

If you do not supply a legend_col parameter, the process objects will be
automatically colored by level in the hierarchy.

Processes are correctly sorted by process time

	path	ImageFileName	CreateTime
proc_key
registry|88|2021-04-01 05:04:54.000000	116/0	Registry	2021-04-01 05:04:54+00:00
system|4|2021-04-01 05:04:58.000000	117/1	System	2021-04-01 05:04:58+00:00
smss.exe|404|2021-04-01 05:04:58.000000	117/1/2	smss.exe	2021-04-01 05:04:58+00:00
csrss.exe|640|2021-04-01 05:05:00.000000	118/3	csrss.exe	2021-04-01 05:05:00+00:00
winlogon.exe|700|2021-04-01 05:05:00.000000	118/4	winlogon.exe	2021-04-01 05:05:00+00:00
dwm.exe|1028|2021-04-01 05:05:02.000000	118/4/17	dwm.exe	2021-04-01 05:05:02+00:00
logonui.exe|512|2021-04-01 05:05:02.000000	118/4/21	LogonUI.exe	2021-04-01 05:05:02+00:00
fontdrvhost.ex|960|2021-04-01 05:05:01.000000	118/4/7	fontdrvhost.ex	2021-04-01 05:05:01+00:00
wininit.exe|632|2021-04-01 05:05:00.000000	119/5	wininit.exe	2021-04-01 05:05:00+00:00
lsass.exe|776|2021-04-01 05:05:01.000000	119/5/10	lsass.exe	2021-04-01 05:05:01+00:00

mp_plot.process_tree and mp.build_process_tree support schema as dictionary

Previously these accessors and the underlying functions plot_process_tree and
build_process_tree would only accept msticpy.transform.process_tree_schema.ProcSchema
instances. These will now accept dictionaries with at least the minimum required
attributes as keys.