On Linux, the starting scripts launch_mantidplot.sh and
launch_mantidworkbench.sh uses the custom allocator Jemalloc via
LD_PRELAOD to better manage the memory (especially the release of the
memory). This commit modifies the creation of those scripts, which is
managed at the CMake step, accordingly.

The minimum is set to Python 3.6 so this can be assumed

On Windows, even though certain things are cached, running
these finders multiple times is costly. Put everything
at the top level. Our current CMake structure does not really
offer options fine-grained control of enabled components
so there is no benefit to the finders being in multiple
places.

It can find all components in one shot and offers
import targets over the traditional global variable
approach.

Adds boost-python to public interface of PythonInterfaceCore
Removes the need for each library to link to it by hand and
it only needs to be found once.

FindPython3 now comes with the ability to find Numpy
so that we can drop some of our finder code

Adds handling for multiple sanitizers using a multi option.

This includes:
- Warning users if they try to use a sanitizer on release builds
- Changing the optimization flag of RelWithDebInfo to get stack traces
- Adding more checks in case someone mis-types
- Adding option for clangs memory sanitizer though this throws an error
  at the moment

Adds the Python library TOML to the required packages list for RHEL /
Debian / Mac. Additionally, it bumps the SHA for MSVC deps to a version
with the required files

Refs #26493

Reorganise RPM dependencies for slightly more clarity.
Refs #27631

The version of python36-sip in EPEL produces a PyQt4 that segfaults
when an eventFilter is overridden in Python. So as to not introduce
any further custom rpms we build and package a private copy of PyQt4
for Python 3 builds on EL7
Refs #27631

Adds enum 34 to the required user packages on RHEL-7 following the enum
conversion

Bumps the minimum CMake version to 3.13, this allows us to use
add_link_options on address sanitizers.
At the time of this commit 3.14 is available for RHEL7, and 3.15 for
Ubuntu. Windows requires 3.15 so in an ideal world we would just set our
minimum to that, but as it's not fully available we settle for the
earlier version at the moment.

Allow use of amongst other things: boost.python.numpy and
boost small_vector
Refs #26480

It is no longer used.

MSVCSetup uses variables that can be set by ParaView to
configure the startup scripts.

The issue was in determining the icon file for the .desktop file. It
had assumed that the icon already existed. This assumes that the icon
file exists only with the "nightly" and "unstable" suffixes.

It was accidentally removed when removing the qtawesome
dependency as it was not directly included.
Refs #26424

Refs #26262

After finding [this
article](https://stackoverflow.com/questions/36358217/what-is-the-difference-between-option-and-set-cache-bool-for-a-cmake-variabl),
clean up the cmake configuration to use `option`.

Matches the windows installation and makes it easier to find
the application without having to open a terminal.

This also gets rid of the variable to separate out packaging the
workbench.