This patch adds support to the haswell sub-architecture (x86_64h) to
scripted processes.

rdar://147208252

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

The newly added
test/API/functionalities/scripted_process_empty_memory_region/dummy_scripted_process.py
imports
examples/python/templates/scripted_process.py
which only has register definitions for x86_64 and arm64.

Only run this test on those two architectures for now.

This patch adds the documentation for a subset of scripting extensions
such as scripted process, scripted thread, operating system threads &
scritped thread plans to the lldb website.

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

This patch introduces an `OperatingSystem` base implementation in the
`lldb` python module to make it easier for lldb users to write their own
implementation.

The `OperatingSystem` base implementation is derived itself from the
`ScriptedThread` base implementation since they share some common grounds.

To achieve that, this patch makes changes to the `ScriptedThread`
initializer since it gets called by the `OperatingSystem` initializer.

I also took the opportunity to document the `OperatingSystem` base
class and methods.

Differential Revision: https://reviews.llvm.org/D159315

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

This patch moves the template files for the various scripting
affordances to a separate directory.

This is a preparatory work for upcoming improvements and consolidations
to other scripting affordances.

Differential Revision: https://reviews.llvm.org/D159310

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>