Make IMDB URLs configurable in MediaInfo

[tsautier]

Problem

IMDB URLs (https://imdb.com, https://imdb.com/find?s=all&q=) were hardcoded in IMDBParser.java. If IMDB changed their domain or URL structure, users couldn't fix it without modifying source code and recompiling.

Solution

Move IMDB URLs to the configuration file (imdb.conf) so users can update them without code changes.

Changes Made

1. Added URL Config to imdb.conf.dist

Added new configuration options:

# IMDB URL settings - change these if IMDB changes their domain
url.base=https://imdb.com
url.search=https://imdb.com/find?s=all&q=
url.title.prefix=https://imdb.com/title/

2. Modified IMDBParser to Load URLs from Config

Changed from hardcoded constants to config-loaded values with sensible defaults:

• Added ConfigLoader.loadPluginConfig("imdb.conf") to constructor
• URLs now read from config with fallback to defaults

Benefits

• Users can update IMDB URLs without recompiling
• Sensible defaults ensure backward compatibility
• If IMDB changes domain, a simple config edit fixes the plugin

Fixes: #126

[tsautier]

@mvangoor @hrxcodes for review