mantra 0.7.7

`mantra` offers a lightweight approach for requirement tracing and coverage.
Documentation 
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# `main_id`: Main requirement ID
## `main_id.sub_id`: Sub-requirement ID

# `other_id`: Other requirement ID

# `id`: Parent ID
## `id.sub_id_1`: Sub ID 1
### `id.sub_id_1.sub_sub_id_1`(manual): Sub-sub ID 1.1
#### `id.sub_id_1.sub_sub_id_1.sub_sub_sub_id_1`: Sub-sub-sub ID 1.1.1
#### `id.sub_id_1.sub_sub_id_1.sub_sub_sub_id_2`: Sub-sub-sub ID 1.1.2
### `id.sub_id_1.sub_sub_id_2`(v1:deprecated): Sub-sub ID 1.2
## `id.sub_id_2`: Sub ID 2
### `id.sub_id_2.sub_sub_id_1`(deprecated): Sub-sub ID 2.1
#### `id.sub_id_2.sub_sub_id_1.sub_sub_sub_id_1`: Sub-sub-sub ID 2.1.1
#### `id.sub_id_2.sub_sub_id_1.sub_sub_sub_id_2`: Sub-sub-sub ID 2.1.2
### `id.sub_id_2.sub_sub_id_2`: Sub-sub ID 2.2
## `id.sub_id_3`: Sub ID 3
### `id.sub_id_3.sub_sub_id_1`: Sub-sub ID 3.1
#### `id.sub_id_3.sub_sub_id_1.sub_sub_sub_id_1`(manual): Sub-sub-sub ID 3.1.1
#### `id.sub_id_3.sub_sub_id_1.sub_sub_sub_id_2`: Sub-sub-sub ID 3.1.2
### `id.sub_id_3.sub_sub_id_2`: Sub-sub ID 3.2