Change object names to camelCase

[wvictor14]

All exported functions and data objects have been renamed to camelCase convention, as per Bioconductor coding style.

• pl_infer_ethnicity -> predictEthnicity
• pl_infer_age -> predictAge
• pl_betas -> plBetas
• pl_pDat -> plPhenoData
• pl_cell_cpgs_third -> plCellCpGsThird
• pl_cell_cpgs_first -> plCellCpGsFirst
• pl_colors <- plColors

pl_infer_ethnicity and pl_infer_age are deprecated.

bumped version to 0.99.0 for bioconductor release

[wvictor14]

From NEWS:

planet 0.99.0

• Improved vignette figure quality
• Using github-actions check from biocthis
• Removed viridis from suggests
• Rewrote many data man pages

planet 0.3.0 (12-17-2020)

• Final preparations for Bioconductor submission
• Changed license to => GPL-2
• More detailed attribution to glmnet
• Renamed all functions to camel case convention, including functions, data, tests, documentation, vignettes
• Added planet-deprecated.R
• pl_infer_ethnicity() and pl_infer_age() now deprecated, replaced with predictEthnicity and predictAge, respectively.