New feature for edit command to replace item IDs, small fix for meta data parsing

[koopa]

Thanks for the toolkit!
Here is a way to replace items in a blueprint.
Also I encountered some errors when I tried to load blueprints which had a "long description".
Not sure if this is new? Just picked up the game a couple of days ago. There was some issue with the b64data_hash.startswith("\"") assert.
Feel free to comment / suggest improvements :)

[koopa]

Example

$ ./dspbptk dump red_science.txt
Name: Red Science 2 / sec
Total building count: 867
  696  ConveyorBeltMKI
  118  SorterMKI
   24  OilRefinery
   12  MatrixLab
    9  TeslaTower
    6  Splitter
    2  StorageTank

$ ./dspbptk edit -f -s 2001 -r 2002 red_science.txt red_science_mk2.txt
696 instances of ConveyorBeltMKI replaced with ConveyorBeltMKII

$ ./dspbptk dump red_science_mk2.txt
Name: Red Science 2 / sec
Total building count: 867
  696  ConveyorBeltMKII
  118  SorterMKI
   24  OilRefinery
   12  MatrixLab
    9  TeslaTower
    6  Splitter
    2  StorageTank