do_baits: Generates random baits
In BelenJM/supeRbaits: Sample Baits From Sequences

Function inspired by this comment in StackOverflow: https://stackoverflow.com/questions/49149839/simulate-random-positions-from-a-list-of-intervals

do_baits(
  n,
  n.per.seq,
  size,
  database,
  lengths,
  exclusions = NULL,
  regions = NULL,
  regions.prop = 0,
  regions.tiling = 1,
  targets = NULL,
  targets.prop = 0,
  targets.tiling = 1,
  seed = NULL,
  restrict,
  gc = c(0, 1),
  min.per.seq = 1,
  verbose = FALSE,
  force = FALSE
)

`n`	Number of baits to generate (distributed across the various sequences).
`n.per.seq`	Number of baits to generate per sequence. Ignored if n is set.
`size`	The size of each bait
`database`	A database of sequences
`lengths`	Optional: the lengths of the sequences, compiled through `load_lengths`. If missing, lengths will be compiled from the database on-the-fly.
`exclusions`	A file containing regions to exclude
`regions`	A file containing regions of interest.
`regions.prop`	The proportion of baits that should overlap the regions of interest.
`regions.tiling`	The minimum number of baits to distribute per region of interest.
`targets`	A file containing bp's to target.
`targets.prop`	The proportion of baits that should overlap the targets.
`targets.tiling`	The minimum number of baits to distribute per target.
`seed`	A number to fix the randomization process, for reproducibility
`restrict`	A vector of chromosome names OR position numbers to which the analysis should be restricted.
`gc`	A vector of two values between 0 and 1, specifying the minimum and maximum GC percentage allowed in the output baits.
`min.per.seq`	Minimum number of baits per sequence. Defaults to 1.
`verbose`	Logical: Should detailed bait processing messages be displayed per sequence?
`force`	Logical: Proceed even if the number of baits requested is very large?