Formatting: change table.length_max to table.max_breaks

[MrLixm]

The current StrFmtSettings.table.length_max doesn't have a name corresponding enough to its correlated use.

• Convert the name to table.max_breaks (see if better can be found)
• Use table.length_max to actually specify the max length of a displayed table :
  • Will correspond to the max length a table can be before being "cut" like { 1,2,3,4,5, [...*5] }