Add landmines

[orwenn22]

this pr adds support for landmines, changes include :

• adding a "Landmines" field to the Map model, it contains the amount of mines in the map
• use an enum instead of a boolean value for the judgement type in score submission
• update FallbackScoreSubmission to support landmines, NMN (no mines) mod and NLN mod
• update CalculateScore to calculate the map's maximum achievable combo with mods applied (this is necessary because NMN and NLN will change the maximum combo)