STYLE: Variable renaming for consistency and simple fixes in graph kernels

ENH: Add support for absolute and relative path for loading graphs
ENH: Variable naming for user-given CLI parameters
ENH: Support to omit labeled regions in TransferLabelsToRegions
ENH: Reflect renaming changes in Experiments JSON files
ENH: Added support for global label file when loading graphs
ENH: Support for a global label file
ENH: Refinement of VascularAtlasGeneration

ENH: CLI documentation in TransferLabelsToRegions.
ENH: Adjusted ExperimentsDriver CLI arguments to reflect args of
     the binaries they are passed to.
ADD: Support in ExperimentsDriver to compute global label maps using
     TransferLabelsToRegions.
ENH: Added support to write SVM info files (with #SVs, predictions, etc.)
STYLE: Remove tabs and spaces at EOL
STYLE: Add README markdown files for each folder

Documentation will gradually be added to the markdown files, but for now they
contain a title and a generic footer. Also created a Base/Common folder, into
which some of the files from Utilities will be added, per discussion in meeting.

ENH: Update Cppcheck suppressions
ENH: Suppress CTK manually-specified variables CMake warning
BUG: Fix inconsistent capitalization of -build/-Build directories
ENH: Add README, LICENSE, and .gitignore files