Default LaTeX preamble: some packages moved to preamble-project.tex

Until now, important LaTeX packages like 'caption' (for managing figure
captions), 'hyperref' (for managing links) and 'xcolor' (for managing
colors) were being loaded inside the optional
'tex/src/preamble-maneagge-defualt-style.tex' file. We recommend to remove
this file from loading when you use custom journal sytels. However, these
packages will often be necessary after loading special journal styles also.

With this commit, these packages are now loaded into LaTeX as part of the
'tex/src/preamble-project.tex' file. This file is in charge of LaTeX
settings that are custom to the project and independent of its style.

Several other small corrections are made with this commit:

 - I noticed that './project make texclean' crashes if no PDF exists in the
   working directory! So a '-f' was added to the 'rm' command of the
   'texclean' rule.

 - As part of the LaTeX Hyperref, we can set general metadata or properties
   for the PDF (that aren't written into the printable PDF, but into the
   file metadata). They can be viewed in many PDF viewers as PDF
   properties. Until now, we were only using the '\projecttitle' macro here
   to write the paper's title. However, thanks to the recently added
   'reproduce/analysis/config/metadata.conf', we now have a lot of useful
   information that can also go here. So the 'metadata-copyright-owner' is
   now used to define the PDF author, and the project's
   'metadata-git-repository' and commit hash are written into the PDF
   subject. But to import these, it was necessary to define them as LaTeX
   macros, hence the addition of these macros in 'initialize.mk'.

 - Some extra packages that aren't necessary to build the default PDF were
   removed in 'preamble-project.tex'.

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