Limit maximum tag size content

Configuration property:
  "tag.size.max"

Change-Id: I8886adbc7104b26566baaf4d51974fba907d772c
Increase string renderer output buffer to 8K

Change-Id: I10d661c88ce5534260bde28e3260126525c8df47
Avoid unnecessary clearing of scratch pad on logline alloc.

Change-Id: I9b22addc74739796c496bbae7303ef15495933a4