engine/exchanges: Add exchange currency state subsystem (#774)

* state: Add management system (init)

* linter: fix

* engine: gofmt

* gct: after merge fixup

* documentation: add

* rpc: implement services for testing

* gctcli: gofmt state_management.go

* documentation: reinstate lost information

* state: Add pair check to determine trading operation

* exchanges: add interface for specific state scoped subsystem functionality

* engine/order_man: reduce code footprint using new method

* RPC: implement pair trading request and change exported name to something specific to state

* engine: add tests

* engine: Add to withdraw manager

* documentation: reinstate soxipy in contrib. list

* engine: const fake name

* Glorious: NITERINOS

* merge: fix issues

* engine: csm incorporate service name into log output

* engine: fix linter issues

* gct: fix tests

* currencystate: remove management type

* rpc: fix tests

* backtester: fix tests

* Update engine/currency_state_manager.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update engine/currency_state_manager.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update exchanges/currencystate/currency_state.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update exchanges/alert/alert.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update exchanges/alert/alert.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* glorious: nits

* config: integrate with config and remove flag delay adjustment

* gctcli: fix issues after name changes

* engine: gofmt manager file

* Update engine/rpcserver.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* engine: Add enable/disable manager functions, add default popoulation for potential assets

* linter: fix

* engine/test: bump subsystem count

* Update engine/currency_state_manager.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update exchanges/bithumb/bithumb.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* glorious: nits addressed

* alert: fix commenting for its generalized purpose

* glorious: nits

* engine: use standard string in log output

* bitfinex: apply patch, thanks @thrasher-

* bitfinex: fix spelling

* engine/currencystate: Add logs/fix logs

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

config/config.go

@@ -1422,6 +1422,19 @@ func (c *Config) CheckDataHistoryMonitorConfig() {
 	}
 }
 
+// CheckCurrencyStateManager ensures the currency state config is valid, or sets
+// default values
+func (c *Config) CheckCurrencyStateManager() {
+	m.Lock()
+	defer m.Unlock()
+	if c.CurrencyStateManager.Delay <= 0 {
+		c.CurrencyStateManager.Delay = defaultCurrencyStateManagerDelay
+	}
+	if c.CurrencyStateManager.Enabled == nil { // default on, when being upgraded
+		c.CurrencyStateManager.Enabled = convert.BoolPtr(true)
+	}
+}
+
 // CheckConnectionMonitorConfig checks and if zero value assigns default values
 func (c *Config) CheckConnectionMonitorConfig() {
 	m.Lock()
@@ -1769,6 +1782,7 @@ func (c *Config) CheckConfig() error {
 
 	c.CheckConnectionMonitorConfig()
 	c.CheckDataHistoryMonitorConfig()
+	c.CheckCurrencyStateManager()
 	c.CheckCommunicationsConfig()
 	c.CheckClientBankAccounts()
 	c.CheckBankAccountConfig()