Updating v1.1.0 to v1.2.0

Major updates to Spectre in v1.2.0. Highlights:

Greatly simplified package dependencies
Reduction in the size of internally stored datasets. Data moved to https://github.com/ImmuneDynamics/data
Fast UMAP implementation (run.umap)
Fast plotting options (fast.colour.plot and fast.multi.plot)
Fast generation of summary statistics (create.sumtable)
Batch integration methods with rPCA (run.rpca)
Minor fixes in CytoNorm and spatial workflows
Inclusion of CI tests

ImmuneDynamics / Spectre