feat: licenses administration basic authentication.

feat: accounts slug.
feat: duplicate accounts_balance table and merge balance with accounts table.
feat: refactoring customers and vendors.
feat: system user soft deleting.
feat: preventing build tenant database without any subscription.
feat: remove 'password' property from 'req.user' object.
feat: refactoring JournalPoster class.
feat: delete duplicated directories and files.

server/src/interfaces/Journal.ts

@@ -0,0 +1,40 @@
+
+
+export interface IJournalEntry {
+  index?: number,
+
+  date: Date,
+  credit: number,
+  debit: number,
+  account: number,
+  referenceType: string,
+  referenceId: number,
+
+  transactionType?: string,
+  note?: string,
+  userId?: number,
+  contactType?: string,
+  contactId?: number,
+};
+
+export interface IJournalPoster {
+  credit(entry: IJournalEntry): void;
+  debit(entry: IJournalEntry): void;
+
+  removeEntries(ids: number[]): void;
+
+  saveEntries(): void;
+  saveBalance(): void;
+  deleteEntries(): void; 
+}
+
+export type TEntryType = 'credit' | 'debit';
+
+export interface IAccountChange {
+  credit: number,
+  debit: number,
+};
+
+export interface IAccountsChange {
+  [key: string]: IAccountChange,
+};