Transform into real factories

[Rob174]

Class to transform

• DatasetFactory
• LossFactory
• MetricsFactory
• Include standardizer into AbstractFabricDatasets
• ModelFactory

Classes to add

• AugmenterFactory
• BalancerFactory -> To transform into generic class Filter
• LabelModifiersFactory

Larger scale modifications

• remove patch adder and replace it by supplying multiple datasets and indicating how to schedule them

[Rob174]

Checkup list:

✔️ ok working nothing left todo ; 🔨 not finished ; 🚨 to be tested; 🎏 many things to do

• ✔️ loss
  • last check: only one to have on_train_start
• ✔️ metrics
• ✔️ saver
• ✔️ model saver
• ✔️ early stopping
• 🚨 progress bar
• ✔️ confusion matrix
• ✔️ rgb_overlay

[Rob174]

Functionnal in commit 568cafa