Apply Symmetric/Reflection padding in Inception Blocks

Use features of #56 (closed) in Inception blocks. Paddings have to be applied before Conv2D

added .todo enhancement labels

mentioned in issue #56 (closed)

added To Do label

added Doing label and removed To Do label

added .doing label and removed .todo label

mentioned in commit e0d362f0

mentioned in commit b2ddff8c

mentioned in commit 72bc0b23

mentioned in commit 73a5fdd5

mentioned in commit 573b3e19

mentioned in merge request !46 (merged)

mentioned in commit 3b7a3f20

added merged in Develop label and removed Doing label

assigned to @kleinert1

mentioned in commit e1bbf647

closed via merge request !59 (merged)