feat: modernize library — rename to angular-csv, update all deps

[Copilot]

The library was targeting Angular 5 (EOL 2018) with a severely outdated toolchain (TypeScript 2.x, Karma 1.x, PhantomJS). This updates everything to current standards.

Renames

• Package: angular5-csv → angular-csv (v1.0.0)
• Files: Angular5-csv.ts → AngularCsv.ts, Angular5-csv.spec.ts → AngularCsv.spec.ts
• Class: Angular5Csv → AngularCsv (Angular5Csv retained as deprecated alias for backward compat)
• Build output: dist/Angular2-csv.js → dist/AngularCsv.js

Code cleanup

• Removed IE-only navigator.msSaveBlob branch
• Replaced custom objectAssign polyfill with native Object.assign
• Added URL.revokeObjectURL() after download to prevent memory leaks

Dependencies

Removed unused/dead packages: @angular/* (never imported), rxjs, webpack, awesome-typescript-loader, es6-shim, phantomjs-prebuilt, karma-phantomjs-launcher, karma-webpack, zone.js, reflect-metadata, @types/js-base64, core-js

Updated dev toolchain:

Package	Before	After
TypeScript	^2.4.2	^5.9.3
karma	^1.7.1	^6.4.4
karma-jasmine	^1.1.1	^5.1.0
karma-chrome-launcher	^2.2.0	^3.2.0
karma-typescript	^3.0.12	^5.5.4
jasmine-core	^2.99.1	^6.3.0

tsconfig target upgraded from ES5 → ES2020.

Migration

// Before
import { Angular5Csv } from 'angular5-csv/dist/Angular5-csv';

// After
import { AngularCsv } from 'angular-csv/dist/AngularCsv';