Round 2 Audit findings

[0xIryna]

The following findings have been addressed

• [H-1] fixed in the commit 73c0f0b
• [H-2] fixed in the commit 687bdd5
• [M-1] fixed in the commit 10fb48f
• [M-2] fixed in the [commit] 6483713
• [M-3] fixed in the commit 423ed33
• [L-1] fixed in the commit d1b75ec
• [L-2] implemented a maintenance window to prevent unlock requests between the last unlock call and the beginning of a new epoch. See commit d1b75ec
• [I-2] implemented in the commit c2bcecf
• [I-6] implemented in the commit cfc5f89
• [I-9] implemented in the commit 24d810b
• [G-1] implemented in the commit 390d52e
• [G-3] implemented in the commit d9a2c77
• [G-5] replaced memory with storage in the commit 76df9d9
• [G-6] implemented in the commit fb2a0c7

Additionally, totalAssets logic has been fixed in the commit 5cf39a9