Finalize DM

See merge request !48

first pass at adding dm package to indexedDb, split some shared code into utils

See merge request !39

# Conflicts:
#	indexedDb/channels/implementation_test.go
#	indexedDb/channels/model.go
#	indexedDb/utils.go

# Conflicts:
#	go.mod
#	go.sum
#	indexedDb/channels/implementation.go
#	indexedDb/channels/model.go
#	indexedDb/implementation_test.go

Add testing with cypher tests

See merge request !45

Fix error reporting in UpdateSentStatus and make Get check if the result is undefined

See merge request !44

Https support

See merge request !42

refactor indexedDb to be more receptive to upcoming project changes

See merge request !41

# Conflicts:
#	go.mod
#	go.sum