Resolve conflicts

Delete function wrapper and function name changes

1. Add: Use custom save function for lazy writer

1. Add: Logs and comments

1. Add: Lazy writer support to write index files.
2. Fix: Index JSON not updated in case of update data.

downloadhelpermdl: Export struct and check for "Last-Modified" header

See merge request !100

get open and role base activity pointer function added

Closes MKCLOS/coreosv3/corestudio#92

See merge request !99

Error code and error addition in grpc response

See merge request !97

Error code and error addition in grpc response

Grpc changes sr

See merge request !96

const changed to var due to build issues on windows

See merge request !95

grpc fixes

const changed to var due to build issues on windows

Removed and restructured code

listner changes for grpc

Fdb reindex, pack, fast read and write

See merge request !94

GRPC changes coresls with latest updates 

FDB changes for reindex, filepack, fast read and write changes

added reindexing feature in fdb,
added filepack module,
modification in filemdl module

Fix: Response for mql/state was invalid json.

See merge request !92

1. Fix: Response for mql/state was invalid json.

Dpk cache method add

See merge request !91

Changes related to GetItemsCount Method added in cachemdl

database server port feature added

See merge request !90

1. Fix: Server connecting to 0 port if not provided