Add initial implementations for various audio processing components

- Created LFO entity for low-frequency oscillation control.
- Added all_pass_filter entity for signal processing.
- Implemented balance_controller for audio balance adjustments.
- Developed debouncer to stabilize input signals.
- Introduced digilent_jstk2 for joystick data handling.
- Added edge_detector_toggle for edge detection functionality.
- Created effect_selector to manage audio effects based on joystick input.
- Implemented jstk_uart_bridge for communication between joystick and UART.
- Developed led_controller for LED management.
- Introduced led_level_controller for controlling multiple LEDs.
- Created moving_average_filter for smoothing input signals.
- Added moving_average_filter_en with enable functionality.
- Implemented mute_controller to handle mute functionality.
- Developed volume_controller for volume adjustments.
- Introduced volume_multiplier for scaling audio signals.
- Created volume_saturator to ensure audio signals stay within bounds.

LAB3/src/balance_controller.vhd

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+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+use ieee.numeric_std.all;
+
+entity balance_controller is
+	generic (
+		TDATA_WIDTH		: positive := 24;
+		BALANCE_WIDTH	: positive := 10;
+		BALANCE_STEP_2	: positive := 6		-- i.e., balance_values_per_step = 2**VOLUME_STEP_2
+	);
+	Port (
+		aclk			: in std_logic;
+		aresetn			: in std_logic;
+
+		s_axis_tvalid	: in std_logic;
+		s_axis_tdata	: in std_logic_vector(TDATA_WIDTH-1 downto 0);
+		s_axis_tready	: out std_logic;
+		s_axis_tlast	: in std_logic;
+
+		m_axis_tvalid	: out std_logic;
+		m_axis_tdata	: out std_logic_vector(TDATA_WIDTH-1 downto 0);
+		m_axis_tready	: in std_logic;
+		m_axis_tlast	: out std_logic;
+
+		balance			: in std_logic_vector(BALANCE_WIDTH-1 downto 0)
+	);
+end balance_controller;
+
+architecture Behavioral of balance_controller is
+
+begin
+
+end Behavioral;