docs: added basic per-package documentation

core/doc.go

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+// Package core contains basic utility functions.
+package core

firewall/doc.go

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+// Package firewall contains the OS specific implementation of the FirewallManager interface.
+package firewall

log/doc.go

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+// Package log contains a transparent interface for logging which interacts with the system event queue.
+package log

modules/doc.go

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+// Package modules contains session modules.
+package modules

net/doc.go

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+// Package net contains network specific code.
+package net

packets/doc.go

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+// Package packets contains structure declarations for network packets and the main packets queue.
+package packets

session/doc.go

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+// Package session contains code to manage the interactive session, modules, environment, etc.
+package session

tls/doc.go

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+// Package tls contains code for TLS certificate generation and signing.
+package tls