MANTA-24 add depth buffer objects from starka
MANTA-24 Update to limit input when graph is very dense

Changes made to better handle high depth and high chimeric complexity based on
BWA-mem + FFPE examples
MANTA-24 fix a second BWA-mem specific centromeric slowdown during the graph build
MANTA-24 limit the maximum num of read pairs stored for each edge during candidate generation
MANTA-24 skip very noisy edges during SV candidate evaluation