[#105] *: Remove `contract` from package names

`contract` postfix is redundant and makes autogenerated
docs looks ugly.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

alphabet/alphabet_contract.go

@@ -1,4 +1,4 @@
-package alphabetcontract
+package alphabet
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop"

audit/audit_contract.go

@@ -1,4 +1,4 @@
-package auditcontract
+package audit
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop"

balance/balance_contract.go

@@ -1,4 +1,4 @@
-package balancecontract
+package balance
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop"

container/container_contract.go

@@ -1,4 +1,4 @@
-package containercontract
+package container
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop"

neofs/neofs_contract.go

@@ -1,4 +1,4 @@
-package smart_contract
+package neofs
 
 /*
 	NeoFS Smart Contract for NEO3.0.

neofsid/neofsid_contract.go

@@ -1,4 +1,4 @@
-package neofsidcontract
+package neofsid
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop"

netmap/netmap_contract.go

@@ -1,4 +1,4 @@
-package netmapcontract
+package netmap
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop"

processing/processing_contract.go

@@ -1,4 +1,4 @@
-package processingcontract
+package processing
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop"

proxy/proxy_contract.go

@@ -1,4 +1,4 @@
-package proxycontract
+package proxy
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop"

reputation/reputation_contract.go

@@ -1,4 +1,4 @@
-package reputationcontract
+package reputation
 
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop"